Bunuel wrote:
The sequence S is defined by \(S_n = S_{n - 1} + S_{n - 2} - 1\) for each integer n ≥ 3. If \(S_1 = 11\) and \(S_3 = 10\), what is the value of \(S_5\)?
(A) 0
(B) 9
(C) 10
(D) 18
(E) 19
Steps:1) Compute S_2 = S_3 - S_1 + 1 = 0
2) Using the same method, compute S_4 = 10 - 1 = 9
3)Now, compute S_5 = 9 + 10 - 1 = 18
Correct answer: DPosted from my mobile device
_________________
Give kudos if you found this post helpful :D
My GMAT history:
1st GMATPrep: 620 (Q46, V29)
2nd GMATPrep: 700(Q46, V40)
3rd GMATPrep: 720(Q49, V38)